From: John W. <joh...@er...> - 2009-03-27 16:51:53
|
We are using the Gumstix Overo and need a replacement for the x86-specific RDTSC real time count function. One idea is to use gettimeofday(). Any other solutions that people can think of? Any tick counter register on the Overo that could be used? Thank you very much for your assistance. Best regards, John John P. Wilson Engineer Erigo Technologies LLC 64 Main St./P.O. Box 899 Enfield, NH 03748 P: 603.632.4156 C: 603.252.2087 F: 603.676.0162 www.erigo.com <http://www.erigo.com> Notice: This email (including attachments) is covered by the Electronic Communications Privacy Act, 18 U.S.C. §§ 2510-2521, is confidential and may be legally privileged. If you are not the intended recipient, you are hereby notified that any retention dissemination, distribution, or copying of this communication is strictly prohibited. Please reply to the sender that you have received the message in error, and then delete it. Thank you. |
From: Vincent <vin...@la...> - 2009-03-27 22:27:07
|
John Wilson wrote: > > We are using the Gumstix Overo and need a replacement for the > > x86-specific RDTSC real time count function. One idea is to use > > gettimeofday(). Any other solutions that people can think of? > > Any tick > > counter register on the Overo that could be used? Hi, It seems the Cortex-A8 has a 'CCNT' register inside cp15, which can be read with an 'MRC' instruction. See http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0344c/Bgbjjhaj.html Note that this 'CCNT' register may or may not be accessible directly from user programs, depending on another 'USEREN' register. Best regards, -- Vincent Stehlé |
From: gnmckinney <gar...@gm...> - 2009-03-27 23:57:15
|
What is the resolution you are looking for? There are several timers running but not being very good with programming I would not have any good suggestions for access to them (grin). If you do 'cat /proc/timer_list' you will see what I mean. Hmmm - is it possible to status the /proc/timer_list to get the info you need??? gm... jpw3 wrote: > > We are using the Gumstix Overo and need a replacement for the x86-specific > RDTSC real time count function. One idea is to use gettimeofday(). Any > other solutions that people can think of? Any tick counter register on > the Overo that could be used? > > > > Thank you very much for your assistance. > > > > Best regards, > > > > John > > > > John P. Wilson > Engineer > Erigo Technologies LLC > 64 Main St./P.O. Box 899 > Enfield, NH 03748 > > P: 603.632.4156 > C: 603.252.2087 > F: 603.676.0162 > > > > www.erigo.com <http://www.erigo.com> > > Notice: This email (including attachments) is covered by the Electronic > Communications Privacy Act, 18 U.S.C. §§ 2510-2521, is confidential and > may be legally privileged. If you are not the intended recipient, you are > hereby notified that any retention dissemination, distribution, or copying > of this communication is strictly prohibited. Please reply to the sender > that you have received the message in error, and then delete it. Thank > you. > > > > > > > ------------------------------------------------------------------------------ > > _______________________________________________ > gumstix-users mailing list > gum...@li... > https://lists.sourceforge.net/lists/listinfo/gumstix-users > > -- View this message in context: http://www.nabble.com/Replacement-for-RDTSC-on-Gumstix-Overo-tp22745920p22752079.html Sent from the Gumstix mailing list archive at Nabble.com. |
From: jpw3 <joh...@er...> - 2009-03-30 21:03:43
|
Thank you very much for the good pointers! -- View this message in context: http://www.nabble.com/Replacement-for-RDTSC-on-Gumstix-Overo-tp22745920p22792837.html Sent from the Gumstix mailing list archive at Nabble.com. |